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<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<style type="text/css">
  body{font-family:'Times New Roman';font-size:20px;line-height:30px;}
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<body>

<div style="position:relative;background:#d4d4d4;width:650px;">
  <div>Problem case 1</div>
  <div style="float:left;width:200px;height:30px;background:#FF9AFF;"></div>
  <span style="background:red;">aaaaaaaaaaaaaaaaaaaaaaa</span>
  <span style="background:red;">bbbbbbbbbbbbbbbbbbbbbbb　　　　　</span>
</div>

<div style="position:relative;background:#d4d4d4;width:650px;">
  <div>Problem case 2</div>
  <div style="float:left;width:200px;height:30px;background:#FF9AFF;"></div>
  <span style="background:red;">aaaaaaaaaaaaaaaaaaaaaaa</span>
  <span style="background:red;">bbbbbbbbbbbbbbbbbbbbbbb</span>
  <span style="background:red;">　　　　　</span>
</div>

<div style="position:relative;background:#d4d4d4;width:650px;">
  <div>Problem case 3</div>
  <div style="float:left;width:200px;height:30px;background:#FF9AFF;"></div>
  <span style="background:red;position:relative;left:-150px">aaaaaaaaaaaaaaaaaaaaaaa　　　　　　　</span>
  <div style="float:left;width:200px;height:30px;background:blue;"></div>
</div>

<div style="position:relative;background:#d4d4d4;width:650px;">
  <div>No problem</div>
  <div style="float:left;width:200px;height:30px;background:#FF9AFF;"></div>
  <span style="background:red;">aaaaaaaaaaaaaaaaaaaaaaa</span>
  <span style="background:red;">bbbbbbbbbbbbbbbbbbbbbbb</span>
  <span style="background:red;">cc　　　　　</span>
</div>

<div style="position:relative;background:#d4d4d4;width:650px;">
  <div>No problem</div>
  <span style="background:red;">ccccccccccccccccccccccccccccccccccccccccccccc　　　　　</span>
</div>

<div style="position:relative;background:#d4d4d4;width:650px;">
  <div>No problem</div>
  <div style="float:left;width:200px;height:30px;background:#FF9AFF;"></div>
  <span style="background:red;">aaaaaa　　　　　　　</span>
  <div style="float:left;width:200px;height:30px;background:blue;"></div>
</div>

</body>
